CN105206394A - Repairing method for surface checking of dry type transformer winding - Google Patents
Repairing method for surface checking of dry type transformer winding Download PDFInfo
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- CN105206394A CN105206394A CN201510526177.XA CN201510526177A CN105206394A CN 105206394 A CN105206394 A CN 105206394A CN 201510526177 A CN201510526177 A CN 201510526177A CN 105206394 A CN105206394 A CN 105206394A
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- type transformer
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Abstract
The invention discloses a repairing method for surface checking of a dry type transformer winding. The method comprises the following steps of 1) removing epoxy resin in a checking area to form a polishing area; 2) repairing the polishing area by using electrical epoxy repair putty so as to form a repairing area; 3) after the electrical epoxy repair putty is solidified, polishing the repairing area so that the surface of the whole winding is smooth and flat; and 4) carrying out integral paint spraying on the winding surface. By using the repairing method provided by the invention, an electrolytic corrosion area can be repaired conveniently, so that the spreading of the electrolytic corrosion area on the surface of the dry type transformer high-voltage winding can be effectively controlled, the hidden danger of the transformer can be eliminated and the safety of the equipment can be improved.
Description
Technical field
The present invention relates to electric equipment maintenance technical field, more particularly, relate to a kind of dry-type transformer winding surface checking restorative procedure.
Background technology
Dry-type transformer is widely used in localized lighting, the place such as skyscraper, factory, and so-called dry-type transformer just refers to that iron core and winding do not infiltrate the transformer in insulating oil, and the type of cooling of this transformer is natural air cooled or forced air cooling.
Because the electric pressure of high pressure dry transformer is higher, in the occasion that some are comparatively special, often have the impact of big current, along with the prolongation of service time, easily make coil heating cause insulation aging and injury in various degree; In addition due to the effect of winding electric field, the easy adsorption of dust of winding table face, this can cause winding surface electric discharge in various degree or creepage, and finally forms water wave sample galvanic corrosion district.And if dry-type transformer is with hidden danger to run for a long time, winding interturn short-circuit will be caused in galvanic corrosion winding surface, and transformer also exists the risk of burning.
Therefore, transformer belt hidden danger how can be avoided to run, the fail safe improving equipment is the technical problem that current those skilled in the art need solution badly.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of dry-type transformer winding surface checking restorative procedure, transformer belt hidden danger can be avoided to run, thus improve the fail safe of equipment operation.
For achieving the above object, the invention provides following technical scheme:
A kind of dry-type transformer winding surface checking restorative procedure, comprises step:
1) throwing of the epoxy resin of rupture zone is removed, form Sanding Area;
2) adopt electric power epoxy repair putty to repair described Sanding Area, form patch area;
3) after described electric power epoxy repair putty solidification, described patch area is polished, and make whole winding surface flat smooth;
4) overall paint vehicle spraying is carried out to winding surface.
Preferably, in described step 1) in, adopt polishing machine to join the epoxy resin throwing of gauze wheel to described rupture zone and remove.
Preferably, the grinding depth of described Sanding Area is 2mm-3mm.
Preferably, the described patch area before polishing exceeds 0.5mm-1mm than other regions of winding.
Preferably, in described step 3) in, first adopt polishing machine to join flap wheel and carry out electric power epoxy putty and throw and remove, then adopt silicon carbide paper to polish to described patch area.
Preferably, in described step 4) in, the paint vehicle of spraying is Polyester Paint or PRTV antifouling flush paint.
Preferably, in described step 1) also comprise before: step 01) adopt compressed air to carry out dust purging to pending dry-type transformer, and surperficial with non-dust cloth coordinated insulation cleaning agent wiping winding.
Preferably, in described step 1) and described step 2) between also comprise: step 11) adopt non-dust cloth wiping is carried out to winding surface.
Preferably, in described step 3) and described step 4) between also comprise: step 31) by the upper and lower folder of dry-type transformer and exposed iron core cable paper colligation tight; And in described step 4) after also comprise: step 5) remove the cable paper of original colligation.
Preferably, in described step 31) and described step 4) between also comprise: step 32) adopt non-dust cloth remove winding surface floating dust.
As can be seen here, a kind of dry-type transformer winding surface checking restorative procedure is disclosed in the present invention, in the method, first the epoxy resin of rupture zone is thrown except forming Sanding Area, then on Sanding Area, adopt electric power epoxy repair putty to repair, form patch area, after the solidification of electric power epoxy repair putty, patch area is polished, and make whole winding surface flat smooth, finally overall paint vehicle spraying is carried out to the surface of winding.Adopt this kind of restorative procedure to repair galvanic corrosion district easily, thus effectively control spreading of dry-type transformer high pressure winding surface electrical erosion district, eliminate the hidden danger that transformer exists, improve the fail safe of equipment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of dry-type transformer winding surface checking restorative procedure disclosed in the embodiment of the present invention.
Embodiment
Core of the present invention is to provide a kind of dry-type transformer winding surface checking restorative procedure, transformer belt hidden danger can be avoided to run, thus improves the fail safe of equipment operation.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Dry-type transformer winding surface checking restorative procedure disclosed in the present invention, be mainly used in high-tension transformer surface because of electric discharge or creepage and water wave shape rupture zone that is that produce is repaired, concrete, this restorative procedure comprises the following steps:
S1) rupture zone polishing
In this step, manual polishing machine can be adopted, and with the use of flap wheel, the throwing that former epoxy resin is carried out in rupture zone is removed, thus formation Sanding Area, flap wheel is No. 80 flap wheels preferably, the grinding depth of Sanding Area is advisable with 2mm-3mm, and to make to carry out Efficient software patching to rupture zone on the one hand, another conveniently can avoid damaging winding inside;
S2) repair
Electric power epoxy repair putty is adopted to repair Sanding Area, thus formation patch area, in order to what ensure patch area, there are reliable insulation property, in the embodiment of the present invention, the preferred LD-216 electric power epoxy repair putty that adopts is repaired Sanding Area, this kind of electric power epoxy repair putty is purchased in Shijiazhuang Li Ding Electron Material Co., Ltd, certainly, also the electric power epoxy repair putty that other producers produce can be adopted, this kind of material is a kind of well known materials at present, commercially be easy to buy, it is the filler by high performance epoxy resin and high-quality, auxiliary agent and curing agent formulated.This kind of putty has good insulating properties, compared with high thixotropic and extraordinary operability, can easily blade coating on electric product surface, thus reach fill and lead up, repair, the object of water proof anti-soil, through testing its performance index as table 1 and table 2.
Table 1LD-216 electric power epoxy repair putty mechanical performance
Table 2LD-216 electric power epoxy repair putty electric property
As everyone knows, LD-216 electric power epoxy repair putty comprises A material and B material, A material is host, B material is curing agent, both mix after getting according to the weight ratio of 1:1 by A material and B material, stir and within 5-10 minute, make A expect and the fully mixing of B material, and then carry out the repairing of Sanding Area with electric drill, patch area should exceed 0.5mm-1mm, to stop surplus for follow-up polishing step than other regions of winding.
S3) patch area polishing
After treating the solidification of electric power epoxy repair putty, polish to patch area, the surfacing of whole winding should be made after completing polishing smooth, and namely patch area is concordant with other regions; When polishing to patch area, preferred line adopt polishing machine to join throwing that flap wheel carries out electric power epoxy putty removes, then adopt silicon carbide paper to polish to patch area, flap wheel and silicon carbide paper all adopt No. 80 to be advisable.
What needs were described is, adopt the electric power epoxy repair putty of different model, or adopt same model but the electric power epoxy repair putty of different manufacturers, the difference of curing time is brought in capital, and the curing time of the LD-216 electric power epoxy repair putty adopted in the embodiment of the present invention is at least 12 hours, if the time allows, after 48 hours, the performance of electric power epoxy repair putty reaches best, now polishes to patch area again, can ensure the stability of patch area putty.
S4) paint vehicle spraying
In order to prevent the electric power epoxy putty on winding surface from making moist, also need spraying winding surface being carried out to overall paint vehicle.
Visible, adopt restorative procedure disclosed in above-described embodiment to repair galvanic corrosion district easily, thus effectively control spreading of dry-type transformer high pressure winding surface electrical erosion district, eliminate the hidden danger that transformer exists, improve the fail safe of equipment.
What needs were described is, step S4 at above-described embodiment) in, the paint vehicle that Transformer Winding surface sprays is Polyester Paint or PRTV antifouling flush paint, Polyester Paint is preferably purchased 193 polyester that extraordinary insulating material factory produces in Shandong Penglai City and is dried paint, certainly, 193 polyester that other producers also can be adopted to produce dry paint, this kind of material is a kind of well known materials at present, commercially be easy to buy, it is hard smooth that 193 polyester dry paint paint film, resistance to mineral oil, there is good moisture resistance, be applicable to various motor coil, rotor, transformer surface treatment, the performance index of paint are dried as table 3 through test 193 polyester.
Table 3193 polyester dries paint performance index
And if the infield of dry-type transformer is in sough, insulation is affected in order to prevent the winding moisture absorption, alternative 193 polyester of PRTV antifouling flush paint should be adopted to dry paint spray winding surface, air compressor machine is adopted to coordinate spray gun in paint vehicle spraying process, by winding top to bottom even application, and the winding completed after paint vehicle spraying should hang more than 4 hours.
In order to optimize the technical scheme in above-described embodiment further, in step S1) be also provided with step before: S01) adopt compressed air to carry out dust purging to pending dry-type transformer, and with non-dust cloth coordinated insulation cleaning agent wiping winding surface, to avoid missing crackle tiny on winding.
Due to complete rupture zone polishing after, have a large amount of floating dust and stick to winding surface, and adhere to floating dust easily the adhesiveness of electric power epoxy repair putty is impacted, for this reason in step S1) and step S2) between also comprise: step S11) adopt non-dust cloth to carry out wiping to winding surface.
Dry-type transformer upper, lower clamping and exposed iron core position should emanation spraying paints, in order to avoid paint vehicle is sprayed on above-mentioned parts, in step S3) and step S4) between also comprise: upper step S31) by dry-type transformer, lower clamping piece and exposed iron core cable paper colligation tight, the thickness preferably 0.12mm of cable paper, so that for paint vehicle spraying is prepared, after treating paint vehicle spraying, also the cable paper wrapped on above-mentioned parts should be removed, therefore in step S4) after also comprise: cable paper step S5) removing original colligation.
Owing to having carried out the polishing of patch area before paint vehicle spraying, this causes a large amount of floating dust to stick in Transformer Winding equally, in order to prevent floating dust, paint vehicle spraying process is impacted, in step S31) and step S4) between also comprise step: S32) adopt non-dust cloth remove winding surface floating dust.
After completing rupture zone, dry-type transformer winding surface and repairing, also detect transformer in the embodiment of the present invention, the standard of transformer Interventions Requested is:
(1) winding D.C. resistance:
1) more than 1.6MVA transformer, the mutual difference of each phase winding resistance is not more than 2% of three-phase mean value, and without the winding that neutral point is drawn, between line, difference is not more than 1% of three-phase mean value;
2) 1.6MVA and following transformer, alternate difference is not more than 4% of three-phase mean value, and between line, difference is not more than 2% of three-phase mean value;
3) compared with former same area measured value, its change is less than 2%;
(2) winding insulation resistance, absorptance or (with) polarization index:
1) under insulation resistance is scaled to same temperature, should without significant change compared with a front test result;
2) absorptance (10 ~ 30 DEG C of scopes) is greater than 1.3.
(3) iron core (have outer draw earth connection) insulation resistance
1) compared with former test result without marked difference;
2) in running, iron core grounding current is less than 0.1A.
(4) the tg δ of winding
1) 20 DEG C time tg δ be not more than following numerical value: 66-220KV0.8%, 35KV and following 1.5%.
2) tg δ value and numeric ratio over the years comparatively do not have marked change (being generally not more than 30%).
(5) transformation ratio
Transformation ratio: ± 0.5.
(6) AC voltage withstand test
Withstand voltage test is done by 0.85 times of test voltage value of dispatching from the factory.
Test to adopting the dry-type transformer of restorative procedure reparation disclosed in the present invention with reference to above-mentioned test stone, find that the dry-type transformer after repairing meets above-mentioned standard, this also just demonstrates above-mentioned restorative procedure is feasible, and the dry-type transformer adopting above-mentioned restorative procedure to repair can effectively be avoided the diffusion in galvanic corrosion district and spread, thus ensure the safe operation of transformer and power equipment.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a dry-type transformer winding surface checking restorative procedure, is characterized in that, comprise step:
1) throwing of the epoxy resin of rupture zone is removed, form Sanding Area;
2) adopt electric power epoxy repair putty to repair described Sanding Area, form patch area;
3) after described electric power epoxy repair putty solidification, described patch area is polished, and make whole winding surface flat smooth;
4) overall paint vehicle spraying is carried out to winding surface.
2. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, is characterized in that, in described step 1) in, adopt polishing machine to join the epoxy resin throwing of gauze wheel to described rupture zone and remove.
3. dry-type transformer winding surface checking restorative procedure as claimed in claim 2, it is characterized in that, the grinding depth of described Sanding Area is 2mm-3mm.
4. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, it is characterized in that, the described patch area before polishing exceeds 0.5mm-1mm than other regions of winding.
5. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, is characterized in that, in described step 3) in, first adopt polishing machine to join flap wheel and carry out electric power epoxy putty and throw and remove, then adopt silicon carbide paper to polish to described patch area.
6. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, is characterized in that, in described step 4) in, the paint vehicle of spraying is Polyester Paint or PRTV antifouling flush paint.
7. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, it is characterized in that, in described step 1) also comprise before: step 01) adopt compressed air to carry out dust purging to pending dry-type transformer, and surperficial with non-dust cloth coordinated insulation cleaning agent wiping winding.
8. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, is characterized in that, in described step 1) and described step 2) between also comprise: step 11) employing non-dust cloth carries out wiping to winding surface.
9. dry-type transformer winding surface checking restorative procedure as claimed in claim 1, it is characterized in that, in described step 3) and described step 4) between also comprise: step 31) by the upper and lower folder of dry-type transformer and exposed iron core cable paper colligation tight; And in described step 4) after also comprise: step 5) remove the cable paper of original colligation.
10. dry-type transformer winding surface checking restorative procedure as claimed in claim 9, is characterized in that, in described step 31) and described step 4) between also comprise: step 32) adopt non-dust cloth to remove the surperficial floating dust of winding.
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| CN201510526177.XA CN105206394B (en) | 2015-08-25 | 2015-08-25 | A kind of dry-type transformer winding surface checking restorative procedure |
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| CN201510526177.XA CN105206394B (en) | 2015-08-25 | 2015-08-25 | A kind of dry-type transformer winding surface checking restorative procedure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914958A (en) * | 2016-05-30 | 2016-08-31 | 陈龙银 | Restoration method used for high-low voltage flat wire winding motor |
| CN106229128A (en) * | 2016-09-05 | 2016-12-14 | 南方电网科学研究院有限责任公司 | A kind of method for repairing and reinforcing of dry-type air-core reactor |
| CN111313298A (en) * | 2020-03-09 | 2020-06-19 | 岭东核电有限公司 | Method for overhauling pouring type current transformer for nuclear power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106229128A (en) * | 2016-09-05 | 2016-12-14 | 南方电网科学研究院有限责任公司 | A kind of method for repairing and reinforcing of dry-type air-core reactor |
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| CN111313298A (en) * | 2020-03-09 | 2020-06-19 | 岭东核电有限公司 | Method for overhauling pouring type current transformer for nuclear power station |
| CN111313298B (en) * | 2020-03-09 | 2021-05-25 | 岭东核电有限公司 | Method for overhauling pouring type current transformer for nuclear power station |
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